
<!DOCTYPE html>
<meta charset="utf-8">
<style>

.axis text {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.line {
  fill: none;
  stroke-width: 1.5px;
}

.dot {
  fill: #fff;
  stroke: #000;
}

</style>
<body>
<script src="d3.js"></script>
<script>
function a() {
    console.log("1");
    a();
}
a()
var margin = {top: 40, right: 40, bottom: 40, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.linear()
    .domain([0, 1])
    .range([0, width]);

var y = d3.scale.linear()
    .domain([0, 1])
    .range([height, 0]);

var z = d3.scale.linear()
    .domain([2 / 3, 1]) // D3 3.x tension is buggy!
    .range(["brown", "steelblue"]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var line = d3.svg.line()
    .interpolate("cardinal")
    .x(function(d) { return x(d.x); })
    .y(function(d) { return y(d.y); });

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.tsv("data.tsv", type, function(error, data) {
  if (error) throw error;

  svg.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

  svg.append("g")
      .attr("class", "axis axis--y")
      .call(yAxis);
console.log(z.ticks(3	));
  svg.selectAll(".line")
      .data(z.ticks(3))
    .enter().append("path")
      .attr("class", "line")
      .attr("d", function(d) { console.log(d);return line.tension(d)(data); })
      .style("stroke", z);

  svg.selectAll(".dot")
      .data(data)
    .enter().append("circle")
      .attr("class", "dot")
      .attr("cx", function(d) { return x(d.x); })
      .attr("cy", function(d) { return y(d.y); })
      .attr("r", 3.5);
});

function type(d) {
  d.x = +d.x;
  d.y = +d.y;
  return d;
}

</script>
